{"id":"CVE-2026-49991","state":"PUBLISHED","title":"RustFS Snowball Auto-Extract: Path Traversal allows cross-bucket object injection","description":"RustFS is a distributed object storage system built in Rust. In 1.0.0-beta.4, authenticated users with only PutObject permission on their own bucket can exploit a path traversal vulnerability in the Snowball auto-extract feature to write arbitrary objects into other users' buckets, completely breaking multi-tenant isolation. The vulnerability chains three flaws: No ../ sanitization in tar entry key normalization; IAM wildcard matching uses raw (uncleaned) paths; and Filesystem path cleaning resolves ../ across bucket boundaries.","publishedAt":"2026-06-26T20:01:29.896Z","updatedAt":"2026-06-29T13:15:10.741Z","severity":{"score":8.6,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N","source":"GitHub_M"},"assigner":"GitHub_M","products":["rustfs rustfs"],"affected":[{"vendor":"rustfs","product":"rustfs","versions":[{"version":"1.0.0-beta.4","status":"affected"}]}],"references":["https://github.com/rustfs/rustfs/security/advisories/GHSA-f4vq-9ffr-m8m3"],"weaknesses":["CWE-22","CWE-862"],"ingestedAt":"2026-10-29T20:12:07.131Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/49xxx/CVE-2026-49991.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-49991","state":"PUBLISHED","datePublished":"2026-06-26T20:01:29.896Z","dateUpdated":"2026-06-29T13:15:10.741Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-06-02T18:30:51.283Z"},"containers":{"cna":{"title":"RustFS Snowball Auto-Extract: Path Traversal allows cross-bucket object injection","descriptions":[{"lang":"en","value":"RustFS is a distributed object storage system built in Rust. In 1.0.0-beta.4, authenticated users with only PutObject permission on their own bucket can exploit a path traversal vulnerability in the Snowball auto-extract feature to write arbitrary objects into other users' buckets, completely breaking multi-tenant isolation. The vulnerability chains three flaws: No ../ sanitization in tar entry key normalization; IAM wildcard matching uses raw (uncleaned) paths; and Filesystem path cleaning resolves ../ across bucket boundaries."}],"affected":[{"vendor":"rustfs","product":"rustfs","versions":[{"version":"1.0.0-beta.4","status":"affected"}]}],"references":[{"url":"https://github.com/rustfs/rustfs/security/advisories/GHSA-f4vq-9ffr-m8m3","name":"https://github.com/rustfs/rustfs/security/advisories/GHSA-f4vq-9ffr-m8m3","tags":["x_refsource_CONFIRM"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":8.6,"baseSeverity":"HIGH","confidentialityImpact":"NONE","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"CHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-22","lang":"en","description":"CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')","type":"CWE"}]},{"descriptions":[{"cweId":"CWE-862","lang":"en","description":"CWE-862: Missing Authorization","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-06-26T20:01:29.896Z"},"source":{"advisory":"GHSA-f4vq-9ffr-m8m3","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","references":[{"url":"https://github.com/rustfs/rustfs/security/advisories/GHSA-f4vq-9ffr-m8m3","tags":["exploit"]}],"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-06-29T13:13:51.281652Z","id":"CVE-2026-49991","options":[{"Exploitation":"poc"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-06-29T13:15:10.741Z"}}]}}}